Vulkan dependency detection when cross compiling (Yocto)

[jwinarske]

When detecting Vulkan dependency in cross compile case (Yocto) what is the proper pattern for deriving the absolute includedir?

I'm doing this:

vulkan_dep = dependency('vulkan')
vulkan_hpp = join_paths([
    vulkan_dep.get_pkgconfig_variable('includedir'),
    'vulkan',
    'vulkan.hpp'
    ])

How do I get sysroot to affect this, as I always end up with /usr/include/vulkan/vulkan.hpp.

[dcbaker]

Is the vulkan dependency correct in that case at all, or is it just getting the pkg-config variable that is broken? This could be a bug

[jwinarske]

It's the same...

This is clearly wrong:
https://github.com/KhronosGroup/Vulkan-Loader/blob/master/loader/vulkan.pc.in

I'll submit a PR.

KhronosGroup/Vulkan-Loader#490

[dcbaker]

Please mention me on that, I'm a khronos member so my review there might speed things up :)

[jwinarske]

KhronosGroup/Vulkan-Loader#756

[jwinarske]

merged

[dcbaker]

I went ahead and marked this as answered

[jwinarske]

While now I have a correct vulkan.pc meson is still ignoring PKG_CONFIG_SYSROOT_DIR and returning the same value as before. If PKG_CONFIG_SYSROOT_DIR is set pkg-config should honor it, which indicates it's not available at runtime.

vulkan_hpp = join_paths([
    vulkan_dep.get_pkgconfig_variable('includedir'),
    'vulkan',
    'vulkan.hpp'
    ])

Re-opened issue: #9674

[jwinarske]

This is the functional pattern

1. Correctly implemented package config file. @dcbaker thank you.

2. Meson

vulkan_dep = dependency('vulkan')
vulkan_hpp = join_paths([
    vulkan_dep.get_pkgconfig_variable('includedir', define_variable: ['prefix', get_option('prefix')]),
    'vulkan',
    'vulkan.hpp'
    ])

3. Yocto Recipe

EXTRA_OEMESON += "--prefix ${STAGING_DIR_TARGET}/usr"

This project now correctly builds on desktop and Yocto: https://github.com/jwinarske/vkmark/tree/jw/vulkan_dep